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. (1372). EXTRACTION-SPECTROPHOTOMETRIC DETERMINATION OF AMMONIUM ION BY DIBENZO- 18-CROWN-6 AND CALMAGITE. , 4(2), -.
. "EXTRACTION-SPECTROPHOTOMETRIC DETERMINATION OF AMMONIUM ION BY DIBENZO- 18-CROWN-6 AND CALMAGITE". , 4, 2, 1372, -.
. (1372). 'EXTRACTION-SPECTROPHOTOMETRIC DETERMINATION OF AMMONIUM ION BY DIBENZO- 18-CROWN-6 AND CALMAGITE', , 4(2), pp. -.
. EXTRACTION-SPECTROPHOTOMETRIC DETERMINATION OF AMMONIUM ION BY DIBENZO- 18-CROWN-6 AND CALMAGITE. , 1372; 4(2): -.

EXTRACTION-SPECTROPHOTOMETRIC DETERMINATION OF AMMONIUM ION BY DIBENZO- 18-CROWN-6 AND CALMAGITE

Journal of Sciences, Islamic Republic of Iran
مقاله 3، دوره 4، شماره 2، شهریور 1993    اصل مقاله (323.52 K)
چکیده
An extraction-spectrophotometric method for the determination of trace amounts
of ammonium ion is described. Ammonium ion is effectively extracted as a neutral
ternary complex NH . DB 18C6. calmagite at pH 3.0 into chloroform, followed by
spectrophotometric determination at =48 5 nm. Molar absorptivity of the ternary
complex at this wavelength is 1.08 10 mol cm . Beer's law is obeyed over the
range 0.5-9.0 g ml and the Sandell's sensitivity for 0.001 absorbance unit is 16.7
ng cm . The method is simple, rapid and free from interferences of several cations
and anions which are usually present with NH ion in real samples
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چکیده [English]
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